The red raccoon's tail thorn is poisonous. Creatures often wave their tails to stab, and people are often stabbed when fishing or handling fish. Because the serrations on both sides of the tail thorn are inverted teeth, the serrations on both sides of the tail thorn will often cause serious laceration to the surrounding tissues when it is pulled out after being pierced into the meat, and the venom secreted by the poison gland of the tail thorn will make the patient immediately suffer from acute pain and burning sensation, and then the whole body will suffer from pain and spasm. The wound soon turns gray and pale, and then the surrounding skin becomes red and swollen, accompanied by systemic symptoms, such as decreased blood pressure, vomiting, diarrhea, fever and chills, rapid heartbeat, muscle paralysis, and even death. If it is treated in time, it is no problem. If it is not treated properly, it can still recur after a few days, and there are sequelae. If your finger is injured, it will be stiff and unable to bend.

According to 1995 "Dangerous Marine Life-Field First Aid Guide", stingray is the largest poisonous fish known at present, with a tail up to 37 cm long. If stabbed in the chest, it will cause serious injury or even death, especially heart injury, which requires emergency surgery, but the heart is usually injured from birth to death. Australian crocodile hunter Owen was killed by a stingray.